source: src/GenPoly/Lvalue.cc@ 184557e

new-env
Last change on this file since 184557e was 28f3a19, checked in by Aaron Moss <a3moss@…>, 7 years ago

Merge branch 'master' into with_gc
  • Property mode set to 100644
File size: 22.6 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// Lvalue.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Mon May 18 07:44:20 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Fri Mar 17 09:11:18 2017
13// Update Count : 5
14//
15
16#include <cassert> // for strict_dynamic_cast
17#include <string> // for string
18
19#include "Common/PassVisitor.h"
20#include "GenPoly.h" // for isPolyType
21#include "Lvalue.h"
22
23#include "Parser/LinkageSpec.h" // for Spec, isBuiltin, Intrinsic
24#include "ResolvExpr/TypeEnvironment.h" // for AssertionSet, OpenVarSet
25#include "ResolvExpr/Unify.h" // for unify
26#include "ResolvExpr/typeops.h"
27#include "SymTab/Autogen.h"
28#include "SymTab/Indexer.h" // for Indexer
29#include "SynTree/Declaration.h" // for Declaration, FunctionDecl
30#include "SynTree/Expression.h" // for Expression, ConditionalExpr
31#include "SynTree/Mutator.h" // for mutateAll, Mutator
32#include "SynTree/Statement.h" // for ReturnStmt, Statement (ptr o...
33#include "SynTree/Type.h" // for PointerType, Type, FunctionType
34#include "SynTree/Visitor.h" // for Visitor, acceptAll
35
36#if 0
37#define PRINT(x) x
38#else
39#define PRINT(x)
40#endif
41
42namespace GenPoly {
43 namespace {
44 // TODO: fold this into the general createDeref function??
45 Expression * mkDeref( Expression * arg ) {
46 if ( SymTab::dereferenceOperator ) {
47 // note: reference depth can be arbitrarily deep here, so peel off the outermost pointer/reference, not just pointer because they are effecitvely equivalent in this pass
48 VariableExpr * deref = new VariableExpr( SymTab::dereferenceOperator );
49 deref->result = new PointerType( Type::Qualifiers(), deref->result );
50 Type * base = InitTweak::getPointerBase( arg->result );
51 assertf( base, "expected pointer type in dereference (type was %s)", toString( arg->result ).c_str() );
52 ApplicationExpr * ret = new ApplicationExpr( deref, { arg } );
53 ret->result = base->clone();
54 ret->result->set_lvalue( true );
55 return ret;
56 } else {
57 return UntypedExpr::createDeref( arg );
58 }
59 }
60
61 struct ReferenceConversions final : public WithStmtsToAdd {
62 Expression * postmutate( CastExpr * castExpr );
63 Expression * postmutate( AddressExpr * addrExpr );
64 };
65
66 /// Intrinsic functions that take reference parameters don't REALLY take reference parameters -- their reference arguments must always be implicitly dereferenced.
67 struct FixIntrinsicArgs final {
68 Expression * postmutate( ApplicationExpr * appExpr );
69 };
70
71 struct FixIntrinsicResult final : public WithGuards {
72 Expression * postmutate( ApplicationExpr * appExpr );
73 void premutate( FunctionDecl * funcDecl );
74 bool inIntrinsic = false;
75 };
76
77 /// Replace reference types with pointer types
78 struct ReferenceTypeElimination final {
79 Type * postmutate( ReferenceType * refType );
80 };
81
82 /// GCC-like Generalized Lvalues (which have since been removed from GCC)
83 /// https://gcc.gnu.org/onlinedocs/gcc-3.4.6/gcc/Lvalues.html#Lvalues
84 /// Replaces &(a,b) with (a, &b), &(a ? b : c) with (a ? &b : &c)
85 struct GeneralizedLvalue final : public WithVisitorRef<GeneralizedLvalue> {
86 Expression * postmutate( AddressExpr * addressExpr );
87 Expression * postmutate( MemberExpr * memExpr );
88
89 template<typename Func>
90 Expression * applyTransformation( Expression * expr, Expression * arg, Func mkExpr );
91 };
92
93 /// Removes redundant &*/*& pattern that this pass can generate
94 struct CollapseAddrDeref final {
95 Expression * postmutate( AddressExpr * addressExpr );
96 Expression * postmutate( ApplicationExpr * appExpr );
97 };
98
99 struct AddrRef final : public WithGuards, public WithVisitorRef<AddrRef>, public WithShortCircuiting {
100 void premutate( AddressExpr * addrExpr );
101 Expression * postmutate( AddressExpr * addrExpr );
102 void premutate( Expression * expr );
103 void premutate( ApplicationExpr * appExpr );
104 void premutate( SingleInit * init );
105
106 void handleNonAddr( Expression * );
107
108 bool first = true;
109 bool current = false;
110 int refDepth = 0;
111 bool addCast = false;
112 };
113 } // namespace
114
115 static bool referencesEliminated = false;
116 // used by UntypedExpr::createDeref to determine whether result type of dereference should be ReferenceType or value type.
117 bool referencesPermissable() {
118 return ! referencesEliminated;
119 }
120
121 void convertLvalue( std::list< Declaration* > & translationUnit ) {
122 PassVisitor<ReferenceConversions> refCvt;
123 PassVisitor<ReferenceTypeElimination> elim;
124 PassVisitor<GeneralizedLvalue> genLval;
125 PassVisitor<FixIntrinsicArgs> fixer;
126 PassVisitor<CollapseAddrDeref> collapser;
127 PassVisitor<AddrRef> addrRef;
128 PassVisitor<FixIntrinsicResult> intrinsicResults;
129 mutateAll( translationUnit, intrinsicResults );
130 mutateAll( translationUnit, addrRef );
131 mutateAll( translationUnit, refCvt );
132 mutateAll( translationUnit, fixer );
133 mutateAll( translationUnit, collapser );
134 mutateAll( translationUnit, genLval );
135 mutateAll( translationUnit, elim ); // last because other passes need reference types to work
136
137 // from this point forward, no other pass should create reference types.
138 referencesEliminated = true;
139 }
140
141 Expression * generalizedLvalue( Expression * expr ) {
142 PassVisitor<GeneralizedLvalue> genLval;
143 return expr->acceptMutator( genLval );
144 }
145
146 namespace {
147 // true for intrinsic function calls that return an lvalue in C
148 bool isIntrinsicReference( Expression * expr ) {
149 // known intrinsic-reference prelude functions
150 static std::set<std::string> lvalueFunctions = { "*?", "?[?]" };
151 if ( UntypedExpr * untyped = dynamic_cast< UntypedExpr * >( expr ) ) {
152 std::string fname = InitTweak::getFunctionName( untyped );
153 return lvalueFunctions.count(fname);
154 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * > ( expr ) ) {
155 if ( DeclarationWithType * func = InitTweak::getFunction( appExpr ) ) {
156 return func->linkage == LinkageSpec::Intrinsic && lvalueFunctions.count(func->name);
157 }
158 }
159 return false;
160 }
161
162 Expression * FixIntrinsicResult::postmutate( ApplicationExpr * appExpr ) {
163 if ( isIntrinsicReference( appExpr ) ) {
164 // eliminate reference types from intrinsic applications - now they return lvalues
165 ReferenceType * result = strict_dynamic_cast< ReferenceType * >( appExpr->result );
166 appExpr->result = result->base->clone();
167 appExpr->result->set_lvalue( true );
168 if ( ! inIntrinsic ) {
169 // when not in an intrinsic function, add a cast to
170 // don't add cast when in an intrinsic function, since they already have the cast
171 Expression * ret = new CastExpr( appExpr, result );
172 std::swap( ret->env, appExpr->env );
173 return ret;
174 }
175 }
176 return appExpr;
177 }
178
179 void FixIntrinsicResult::premutate( FunctionDecl * funcDecl ) {
180 GuardValue( inIntrinsic );
181 inIntrinsic = funcDecl->linkage == LinkageSpec::Intrinsic;
182 }
183
184 Expression * FixIntrinsicArgs::postmutate( ApplicationExpr * appExpr ) {
185 // intrinsic functions don't really take reference-typed parameters, so they require an implicit dereference on their arguments.
186 if ( DeclarationWithType * function = InitTweak::getFunction( appExpr ) ) {
187 FunctionType * ftype = GenPoly::getFunctionType( function->get_type() );
188 assertf( ftype, "Function declaration does not have function type." );
189 // can be of differing lengths only when function is variadic
190 assertf( ftype->parameters.size() == appExpr->args.size() || ftype->isVarArgs, "ApplicationExpr args do not match formal parameter type." );
191
192
193 unsigned int i = 0;
194 const unsigned int end = ftype->parameters.size();
195 for ( auto p : unsafe_group_iterate( appExpr->args, ftype->parameters ) ) {
196 if (i == end) break;
197 Expression *& arg = std::get<0>( p );
198 Type * formal = std::get<1>( p )->get_type();
199 PRINT(
200 std::cerr << "pair<0>: " << arg << std::endl;
201 std::cerr << " -- " << arg->result << std::endl;
202 std::cerr << "pair<1>: " << formal << std::endl;
203 )
204 if ( dynamic_cast<ReferenceType*>( formal ) ) {
205 PRINT(
206 std::cerr << "===formal is reference" << std::endl;
207 )
208 // TODO: it's likely that the second condition should be ... && ! isIntrinsicReference( arg ), but this requires investigation.
209
210 if ( function->linkage != LinkageSpec::Intrinsic && isIntrinsicReference( arg ) ) {
211 // needed for definition of prelude functions, etc.
212 // if argument is dereference or array subscript, the result isn't REALLY a reference, but non-intrinsic functions expect a reference: take address
213
214 // NOTE: previously, this condition fixed
215 // void f(int *&);
216 // int & x = ...;
217 // f(&x);
218 // But now this is taken care of by a reference cast added by AddrRef. Need to find a new
219 // example or remove this branch.
220
221 PRINT(
222 std::cerr << "===is intrinsic arg in non-intrinsic call - adding address" << std::endl;
223 )
224 arg = new AddressExpr( arg );
225 // } else if ( function->get_linkage() == LinkageSpec::Intrinsic && InitTweak::getPointerBase( arg->result ) ) {
226 } else if ( function->linkage == LinkageSpec::Intrinsic && arg->result->referenceDepth() != 0 ) {
227 // argument is a 'real' reference, but function expects a C lvalue: add a dereference to the reference-typed argument
228 PRINT(
229 std::cerr << "===is non-intrinsic arg in intrinsic call - adding deref to arg" << std::endl;
230 )
231 Type * baseType = InitTweak::getPointerBase( arg->result );
232 assertf( baseType, "parameter is reference, arg must be pointer or reference: %s", toString( arg->result ).c_str() );
233 arg->set_result( new PointerType( Type::Qualifiers(), baseType->clone() ) );
234 arg = mkDeref( arg );
235 // assertf( arg->result->referenceDepth() == 0, "Reference types should have been eliminated from intrinsic function calls, but weren't: %s", toCString( arg->result ) );
236 }
237 }
238 ++i;
239 }
240 }
241 return appExpr;
242 }
243
244 // idea: &&&E: get outer &, inner &
245 // at inner &, record depth D of reference type of argument of &
246 // at outer &, add D derefs.
247 void AddrRef::handleNonAddr( Expression * ) {
248 // non-address-of: reset status variables:
249 // * current expr is NOT the first address-of expr in an address-of chain
250 // * next seen address-of expr IS the first in the chain.
251 GuardValue( current );
252 GuardValue( first );
253 current = false;
254 first = true;
255 }
256
257 void AddrRef::premutate( Expression * expr ) {
258 handleNonAddr( expr );
259 GuardValue( addCast );
260 addCast = false;
261 }
262
263 void AddrRef::premutate( AddressExpr * ) {
264 GuardValue( current );
265 GuardValue( first );
266 current = first; // is this the first address-of in the chain?
267 first = false; // from here out, no longer possible for next address-of to be first in chain
268 if ( current ) { // this is the outermost address-of in a chain
269 GuardValue( refDepth );
270 refDepth = 0; // set depth to 0 so that postmutate can find the innermost address-of easily
271 }
272 }
273
274 Expression * AddrRef::postmutate( AddressExpr * addrExpr ) {
275 PRINT( std::cerr << "addr ref at " << addrExpr << std::endl; )
276 if ( refDepth == 0 ) {
277 PRINT( std::cerr << "depth 0, get new depth..." << std::endl; )
278 // this is the innermost address-of in a chain, record depth D
279 if ( ! isIntrinsicReference( addrExpr->arg ) ) {
280 // try to avoid ?[?]
281 // xxx - is this condition still necessary? intrinsicReferences should have a cast around them at this point, so I don't think this condition ever fires.
282 refDepth = addrExpr->arg->result->referenceDepth();
283 PRINT( std::cerr << "arg not intrinsic reference, new depth is: " << refDepth << std::endl; )
284 } else {
285 assertf( false, "AddrRef : address-of should not have intrinsic reference argument: %s", toCString( addrExpr->arg ) );
286 }
287 }
288 if ( current ) { // this is the outermost address-of in a chain
289 PRINT( std::cerr << "current, depth is: " << refDepth << std::endl; )
290 Expression * ret = addrExpr;
291 while ( refDepth ) {
292 // add one dereference for each
293 ret = mkDeref( ret );
294 refDepth--;
295 }
296
297 // if addrExpr depth is 0, then the result is a pointer because the arg was depth 1 and not lvalue.
298 // This means the dereference result is not a reference, is lvalue, and one less pointer depth than
299 // the addrExpr. Thus the cast is meaningless.
300 // TODO: One thing to double check is whether it is possible for the types to differ outside of the single
301 // pointer level (i.e. can the base type of addrExpr differ from the type of addrExpr-arg?).
302 // If so then the cast might need to be added, conditional on a more sophisticated check.
303 if ( addCast && addrExpr->result->referenceDepth() != 0 ) {
304 PRINT( std::cerr << "adding cast to " << addrExpr->result << std::endl; )
305 return new CastExpr( ret, addrExpr->result->clone() );
306 }
307 return ret;
308 }
309 PRINT( std::cerr << "not current..." << std::endl; )
310 return addrExpr;
311 }
312
313 void AddrRef::premutate( ApplicationExpr * appExpr ) {
314 visit_children = false;
315 GuardValue( addCast );
316 handleNonAddr( appExpr );
317 for ( Expression *& arg : appExpr->args ) {
318 // each argument with address-of requires a cast
319 addCast = true;
320 arg = arg->acceptMutator( *visitor );
321 }
322 }
323
324 void AddrRef::premutate( SingleInit * ) {
325 GuardValue( addCast );
326 // each initialization context with address-of requires a cast
327 addCast = true;
328 }
329
330
331 Expression * ReferenceConversions::postmutate( AddressExpr * addrExpr ) {
332 // Inner expression may have been lvalue to reference conversion, which becomes an address expression.
333 // In this case, remove the outer address expression and return the argument.
334 // TODO: It's possible that this might catch too much and require a more sophisticated check.
335 return addrExpr;
336 }
337
338 Expression * ReferenceConversions::postmutate( CastExpr * castExpr ) {
339 // xxx - is it possible to convert directly between reference types with a different base? E.g.,
340 // int x;
341 // (double&)x;
342 // At the moment, I am working off of the assumption that this is illegal, thus the cast becomes redundant
343 // after this pass, so trash the cast altogether. If that changes, care must be taken to insert the correct
344 // pointer casts in the right places.
345
346 // Note: reference depth difference is the determining factor in what code is run, rather than whether something is
347 // reference type or not, since conversion still needs to occur when both types are references that differ in depth.
348
349 Type * destType = castExpr->result;
350 Type * srcType = castExpr->arg->result;
351 int depth1 = destType->referenceDepth();
352 int depth2 = srcType->referenceDepth();
353 int diff = depth1 - depth2;
354
355 if ( diff > 0 && ! srcType->get_lvalue() ) {
356 // rvalue to reference conversion -- introduce temporary
357 // know that reference depth of cast argument is 0, need to introduce n temporaries for reference depth of n, e.g.
358 // (int &&&)3;
359 // becomes
360 // int __ref_tmp_0 = 3;
361 // int & __ref_tmp_1 = _&_ref_tmp_0;
362 // int && __ref_tmp_2 = &__ref_tmp_1;
363 // &__ref_tmp_2;
364 // the last & comes from the remaining reference conversion code
365 SemanticWarning( castExpr->arg->location, Warning::RvalueToReferenceConversion, toCString( castExpr->arg ) );
366
367 static UniqueName tempNamer( "__ref_tmp_" );
368 ObjectDecl * temp = ObjectDecl::newObject( tempNamer.newName(), castExpr->arg->result->clone(), new SingleInit( castExpr->arg ) );
369 PRINT( std::cerr << "made temp: " << temp << std::endl; )
370 stmtsToAddBefore.push_back( new DeclStmt( temp ) );
371 for ( int i = 0; i < depth1-1; i++ ) { // xxx - maybe this should be diff-1? check how this works with reference type for srcType
372 ObjectDecl * newTemp = ObjectDecl::newObject( tempNamer.newName(), new ReferenceType( Type::Qualifiers(), temp->type->clone() ), new SingleInit( new AddressExpr( new VariableExpr( temp ) ) ) );
373 PRINT( std::cerr << "made temp" << i << ": " << newTemp << std::endl; )
374 stmtsToAddBefore.push_back( new DeclStmt( newTemp ) );
375 temp = newTemp;
376 }
377 // update diff so that remaining code works out correctly
378 castExpr->arg = new VariableExpr( temp );
379 PRINT( std::cerr << "update cast to: " << castExpr << std::endl; )
380 srcType = castExpr->arg->result;
381 depth2 = srcType->referenceDepth();
382 diff = depth1 - depth2;
383 assert( diff == 1 );
384 }
385
386 // handle conversion between different depths
387 PRINT (
388 if ( depth1 || depth2 ) {
389 std::cerr << "destType: " << destType << " / srcType: " << srcType << std::endl;
390 std::cerr << "depth: " << depth1 << " / " << depth2 << std::endl;
391 }
392 )
393 if ( diff > 0 ) {
394 // conversion to type with more depth (e.g. int & -> int &&): add address-of for each level of difference
395 Expression * ret = castExpr->arg;
396 for ( int i = 0; i < diff; ++i ) {
397 ret = new AddressExpr( ret );
398 }
399 if ( srcType->get_lvalue() && ! ResolvExpr::typesCompatible( srcType, strict_dynamic_cast<ReferenceType *>( destType )->base, SymTab::Indexer() ) ) {
400 // must keep cast if cast-to type is different from the actual type
401 castExpr->arg = ret;
402 return castExpr;
403 }
404 ret->env = castExpr->env;
405 ret->result = castExpr->result;
406 castExpr->env = nullptr;
407 castExpr->arg = nullptr;
408 castExpr->result = nullptr;
409 return ret;
410 } else if ( diff < 0 ) {
411 // conversion to type with less depth (e.g. int && -> int &): add dereferences for each level of difference
412 diff = -diff; // care only about magnitude now
413 Expression * ret = castExpr->arg;
414 for ( int i = 0; i < diff; ++i ) {
415 ret = mkDeref( ret );
416 // xxx - try removing one reference here? actually, looks like mkDeref already does this, so more closely look at the types generated.
417 }
418 if ( ! ResolvExpr::typesCompatibleIgnoreQualifiers( destType->stripReferences(), srcType->stripReferences(), SymTab::Indexer() ) ) {
419 // must keep cast if types are different
420 castExpr->arg = ret;
421 return castExpr;
422 }
423 ret->env = castExpr->env;
424 ret->result = castExpr->result;
425 ret->result->set_lvalue( true ); // ensure result is lvalue
426 castExpr->env = nullptr;
427 castExpr->arg = nullptr;
428 castExpr->result = nullptr;
429 return ret;
430 } else {
431 assert( diff == 0 );
432 // conversion between references of the same depth
433 if ( ResolvExpr::typesCompatible( castExpr->result, castExpr->arg->result, SymTab::Indexer() ) && castExpr->isGenerated ) {
434 // Remove useless generated casts
435 PRINT(
436 std::cerr << "types are compatible, removing cast: " << castExpr << std::endl;
437 std::cerr << "-- " << castExpr->result << std::endl;
438 std::cerr << "-- " << castExpr->arg->result << std::endl;
439 )
440 Expression * ret = castExpr->arg;
441 castExpr->arg = nullptr;
442 std::swap( castExpr->env, ret->env );
443 return ret;
444 }
445 return castExpr;
446 }
447 }
448
449 Type * ReferenceTypeElimination::postmutate( ReferenceType * refType ) {
450 Type * base = refType->base;
451 Type::Qualifiers qualifiers = refType->get_qualifiers();
452 refType->base = nullptr;
453 return new PointerType( qualifiers, base );
454 }
455
456 template<typename Func>
457 Expression * GeneralizedLvalue::applyTransformation( Expression * expr, Expression * arg, Func mkExpr ) {
458 if ( CommaExpr * commaExpr = dynamic_cast< CommaExpr * >( arg ) ) {
459 Expression * arg1 = commaExpr->arg1->clone();
460 Expression * arg2 = commaExpr->arg2->clone();
461 Expression * ret = new CommaExpr( arg1, mkExpr( arg2 )->acceptMutator( *visitor ) );
462 ret->env = expr->env;
463 expr->env = nullptr;
464 return ret;
465 } else if ( ConditionalExpr * condExpr = dynamic_cast< ConditionalExpr * >( arg ) ) {
466 Expression * arg1 = condExpr->arg1->clone();
467 Expression * arg2 = condExpr->arg2->clone();
468 Expression * arg3 = condExpr->arg3->clone();
469 ConditionalExpr * ret = new ConditionalExpr( arg1, mkExpr( arg2 )->acceptMutator( *visitor ), mkExpr( arg3 )->acceptMutator( *visitor ) );
470 ret->env = expr->env;
471 expr->env = nullptr;
472
473 // conditional expr type may not be either of the argument types, need to unify
474 using namespace ResolvExpr;
475 Type* commonType = nullptr;
476 TypeEnvironment newEnv;
477 AssertionSet needAssertions, haveAssertions;
478 OpenVarSet openVars;
479 unify( ret->arg2->result, ret->arg3->result, newEnv, needAssertions, haveAssertions, openVars, SymTab::Indexer(), commonType );
480 ret->result = commonType ? commonType : ret->arg2->result->clone();
481 return ret;
482 }
483 return expr;
484 }
485
486 Expression * GeneralizedLvalue::postmutate( MemberExpr * memExpr ) {
487 return applyTransformation( memExpr, memExpr->aggregate, [=]( Expression * aggr ) { return new MemberExpr( memExpr->member, aggr ); } );
488 }
489
490 Expression * GeneralizedLvalue::postmutate( AddressExpr * addrExpr ) {
491 return applyTransformation( addrExpr, addrExpr->arg, []( Expression * arg ) { return new AddressExpr( arg ); } );
492 }
493
494 Expression * CollapseAddrDeref::postmutate( AddressExpr * addrExpr ) {
495 Expression * arg = addrExpr->arg;
496 if ( isIntrinsicReference( arg ) ) {
497 std::string fname = InitTweak::getFunctionName( arg );
498 if ( fname == "*?" ) {
499 Expression *& arg0 = InitTweak::getCallArg( arg, 0 );
500 Expression * ret = arg0;
501 ret->set_env( addrExpr->env );
502 arg0 = nullptr;
503 addrExpr->env = nullptr;
504 return ret;
505 }
506 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * > ( arg ) ) {
507 // need to move cast to pointer type out a level since address of pointer
508 // is not valid C code (can be introduced in prior passes, e.g., InstantiateGeneric)
509 if ( InitTweak::getPointerBase( castExpr->result ) ) {
510 addrExpr->arg = castExpr->arg;
511 castExpr->arg = addrExpr;
512 castExpr->result = new PointerType( Type::Qualifiers(), castExpr->result );
513 return castExpr;
514 }
515 }
516 return addrExpr;
517 }
518
519 Expression * CollapseAddrDeref::postmutate( ApplicationExpr * appExpr ) {
520 if ( isIntrinsicReference( appExpr ) ) {
521 std::string fname = InitTweak::getFunctionName( appExpr );
522 if ( fname == "*?" ) {
523 Expression * arg = InitTweak::getCallArg( appExpr, 0 );
524 // xxx - this isn't right, because it can remove casts that should be there...
525 // while ( CastExpr * castExpr = dynamic_cast< CastExpr * >( arg ) ) {
526 // arg = castExpr->get_arg();
527 // }
528 if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( arg ) ) {
529 Expression * ret = addrExpr->arg;
530 ret->env = appExpr->env;
531 addrExpr->arg = nullptr;
532 appExpr->env = nullptr;
533 return ret;
534 }
535 }
536 }
537 return appExpr;
538 }
539 } // namespace
540} // namespace GenPoly
541
542// Local Variables: //
543// tab-width: 4 //
544// mode: c++ //
545// compile-command: "make install" //
546// End: //
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